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Photographers' Formulary 20lbs Anhydrous Sodium Thiosulfate
SKU: PYSTHA20LB MFR: 10-1373 20LB
$99.95
Key Features
- Achieve archival quality prints with this 20lb Sodium Thiosulfate fixer.
- Perfect for creating your own custom black and white film fixing solutions.
- Ensure chemical consistency in every batch with our high-quality formula.
- This anhydrous form mixes easily, saving you time in the darkroom.
- Use as a key ingredient in various reducers to control image contrast.
- Ideal for both seasoned pros and darkroom beginners, simple and effective.
Special Order?Estimated to Ship: 09/13/2025
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About Photographers' Formulary Sodium Thiosulfate
What you're looking at is a 20lbs package of Anhydrous Sodium Thiosulfate, a versatile chemical compound with a multitude of uses. This product is primarily used in the preparation of fixing baths, serving as a key ingredient in various reducers. Sodium Thiosulfate, also known as 'hypo', is available in two forms: anhydrous and the more commonly found crystalline form.
The crystalline form of hypo, when dissolved, significantly lowers the water temperature, making it essential to start with water of at least 90 degrees Fahrenheit or 32 degrees Celsius when mixing. On the other hand, the anhydrous form does not have this effect, making it a more convenient option for certain applications.
When substituting, remember to use 64% of the anhydrous salt as a replacement for the crystalline hypo. This 20lbs Anhydrous Sodium Thiosulfate is a reliable choice for those in need of a high-quality, versatile chemical compound for their various needs.
Photographers' Formulary Sodium Thiosulfate Features
- High-quality 20lbs Anhydrous Sodium Thiosulfate for various applications
- Ideal for use in the preparation of fixing baths
- Key ingredient in various reducers
- Convenient alternative to crystalline hypo, without temperature lowering effect
- Suitable for use with water of at least 90 degrees Fahrenheit or 32 degrees Celsius
- Use 64% of this product as a substitute for crystalline hypo